Box-tool for screw-machines or lathes



(No Model.)

J. P. LAVIGNE. B0X Tool. PoR SCREW MAGHINESUB. LATHBS.

PatentedApr. 26, 1898.

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JOSEPH P. LAVIGNE, OF NEV HAVEN, CONNECTICUT.

BOX-TOOL FOR SCREW-MACHINES OR LATHES.

SPECIFICATION forming part of Letters Patent N0. 602,908, dated April 26, 1898.

Application filed Inno 21,1897, Serial No. 641,560. (No model.)

To a/ZZ wwnt it muy concern:

Be it known that I, Josnrn P. Lnvrenn, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in BoX-Tools for Screw-Machines or Lathes; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part or" this specification, and represent, in-

Figure l, a broken view, in side elevation, of a screw-machine provided with my improved box-tool and also provided with a horizontally-arranged horizontally-adjustable rack for coaction therewith; Fig. 2, an enlarged view of the box-tool in front elevation; Fig. 3, a view in vertical section on the line c b of Fig. 2; Fig. et, a view in vertical section on the line c d of Fig. 3.

My invention relates to an improvement in box-tools for screw-machines, lathes, and kindred machines, the object being to provide a tool adapted to produce straight turning in different sizes without changing the cutter and also to produce any desired combination of straight turning and taper turni-ng of any pitch.

With these ends in view my invention consists in a box-tool having certain details of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

In carrying out my invention I employ a box-tool comprising a box having a body portion A, a top plate or cover A therefor, and a long.horizontally-arranged stem A2, by means of which the box is mounted in the turret B ot' the machine and adj ustably held therein by means of a clamping-screw B. The turret may be of any approved construction and arranged in any approved manner to be rotated upon its carriage B2, which is moved back and forth in a straight line upon the bed of the machine. The said box is adapted to receive a vertically-movable toolholder `comprising a head C, having a hori.

Zontal opening C and a stern C2, which extends upwardly into the body portion of the box. The cutter D, whatever may be its shape in cross-section, is inserted into the opening C aforesaid, in which it is longitudinally adjustable and in which it is held in any desired position of adjustment by means of a set-screw C3.

I may here remark that the cutting-tool is uniform in cross-section throughout its length, its cross-sectional form being determined by the character of the work that it is designed it shall do. By constructing and mount-in g the cutter as shown its work is performed by its forward end instead of by its side, so that as the tool wears its forward end can be ground, which will shorten the cutter in length, but which will not affect its cross-sectional form, so that so far as its cutting action is concerned it will remain the saine size as long as it lasts.

The upper end of the stem C2 of the toolholder is formed with a threaded bore C4 for the receptionvof an adjusting-screw E, which is formed with an annular shoulder E', adapted to be received in a shallow circular recess a, formed in the lower face of theftop plate or cover A', which is secured to the box-body A by means of screws o.' a', as shown in Fig. 2. The upper end of the said screw is reduced to form a stem E2 and a shoulder E3, the latter being flush with the upper face of the boxcover A. A pinion F, having a central transverse perforation F, is thereby adapted to be set down over the stem E2 of the screw, so as to rest upon the shoulders ES thereof, the pinion being rigidly connected with the screw by means of a nut G, applied to the threaded upper end of the stem E2 and forcing the pinion down into hard contact with the shoulder E3, so that the screw part-akes of any rotation of the pinion in either direction. It is obvious that by turning the pinion Fin one di` rection or the other the tool-holder will be raised or lowered, with the effect of correspondingly raising or lowering the tool with respect to the work which is held in and rotated by the chuck II of the machine, the said chuck being mounted in the head I of the machine. The work extends through a bushing J, which is mounted in the front wall of the box-body A, as shown by broken lines in Fig. 2, which also shows the provision of a machine with a vertically-m ovable sizing-cutter K, which is containcdin a small housing K', located upon the front wall of the box- IOO hand threads.

body A. The rear wall of the said box-body is cut away and replaced by a removable plate L, held in place by screws L' L', and removed for the insertion and removal of the toolholder into and from the box-body.

By employing a cutter of uniform cross-section throughout its length and arranging it horizontally, so as to employ its forward end for cutting and mounting it so as to raise it and lower it at pleasure, I am enabled to turn either large or small work, as may be desired, without changing the cutter, and also to use the cutter as long as it lasts by simply grinding its forward end, which does not change its cross-section or shape as a cutter. Now to adapt the tool to do tapered cutting or combination straight and tapered cutting I provide it with the pinion F, already described, and furnish for ooaction with this pinion a horizontally-adj ustable rack M, which is attached by means of a screw IW to a clamping-head M2, adapted to be clamped bya horizontal screw M upon a horizontal arm M4, which projects from the head I of the machine. The point in the operation of the box-tool when its pinion engages with the rack so as to be turned thereby determines the character of the work. Thus if it is desired to begin cutting the article being cut on a taper at once the rack is set so that as soon as the machine starts it will be engaged by the pinion of Vthe box-tool, which will be rotated with the immediate effeet of raising or lowering the cutter, according as the screw E is made with left or right On the other hand, if it is desired that the article being shaped should have a cylindrical end then the rack is set so that it will not be engaged by the pinion F of the box-tool until after the tool has operated to form such end, after which the pinion will be engaged with the rack, which will then operate the cutter for forming the required taper. If it is desired that the article being cut shall be uniform throughout its length, the rack M is simply pushed out of the way, so that it does not engage with the pinion of the box-tool in any position thereof. It will be clear that the pitch of the taperproduced by the tool will depend on the rapidity with which the tool-holder is raised and lowered and that that will depend upon the number of teeth in the wheel F. Therefore in order to change the pitch of tapered work I shall preferably provide each box-tool with a set of wheels diiferentiated as to the number of their teeth and designed to be used interchangeably with the box-tool, according to the pitch of taper required.

I wish it particularly understood that my box-tool may be applied to any of the different makes of screw-machines without respect to their particular construction. It is also apparent that details of the box-tool may be varied in some respects from the construction herein shown and described. I would therefore not limit myself to the exact construction herein shown and described, but hold myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A box-tool having a box, a tool-holder located therein and comprising an upwardlyextending stein, a horizontall y-arran ged head containing a horizontal opening for the reception of the tool which is held so as to cut by its forward end, and means for raising and lowering the said tool-holder by ymeans of its upwardly-projecting stern.

2. A box-tool having a box, a tool-holder located therein and comprising an upwardlyextending stem, a horizontally-arran ged head containing a horizontal opening for the reception of the tool which is held so as to cut by its forward end, and a screw entering the upper end of the stem and projecting above the box, and providing for raising and lowering the tool-holder, as desired.

3. A box-tool having a vertically-movable tool-holder, and means for raising and lowering the same including a wheel located above and connected with it and exposed for being engaged by an independently-supported rack by means of which the wheel is turned in one direction or the other for raising and lowering the tool-holder as the work progresses, so as to change the character of the cut.

4. In a screw-machine or lathe, the combination with a box-tool having a verticallymovable tool-holder, and a wheel connected with the said holder for raising and lowering the same; of an adjustable horizontally-arranged rack located in position to be engaged by the said wheel which it actuates in rotation in one direction or the other as the machine operates, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JOSEPH P. LAVIGNE.

Witnesses:

LILLIAN D. KELsEY, GEORGE D. SEYMOUR.

IOO 

